Step 1

Sift flour, baking soda, and salt in a medium bowl. Set aside.

Step 2

In a separate large bowl, beat the softened butter and sugars with a medium-speed mixer. Continue until light and fluffy, about 2-3 minutes. Beat in the eggs individually, then stir in the vanilla.

Step 3

Add the dry ingredients to the wet ingredients and mix just until combined. Gently stir in the oats, chocolate chips, and walnuts (if using). Cover and chill the dough for at least 45 minutes.

Step 4

Preheat the oven to 325 degrees Fahrenheit. Line two baking sheets with parchment paper.

Step 5

Scoop mounds of dough and place them about 2 inches apart on the prepared baking sheets. Bake for 12-14 minutes or until lightly brown around the edges but still soft in the center.

Step 6

Allow the cookies to cool on the baking sheets for 5 minutes. Then, transfer them to a wire rack to cool completely.

Step 7

Serve and enjoy!